hey....
Should be under the water line couple of inches or so. Each person is a little different. This will cut down on the splashing and salt creep
or
Use a filter sock above water line.....and cut out all the micro bubbles......... 
http://www.canreef.com/phpBB2/viewtopic.php?t=17163
Good luck 
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Richard
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My wife believed me when I told her it was only going to cost about $500.00. that was over two years ago and I'm still grounded..... 
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